The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This erect, phallic geological spire wasn't always named so domestically.

A tree bears footwear on the loneliest road in America.

A giant open-air sculpture made of over 200 full-sized boats.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

One of the American Southwest's most extensive collections of Navajo rock art.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

The fifth-longest natural arch in the world, and the longest outside China.

Come for the speed, leave in love with the desert.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This parking garage has given itself over to graffiti artists and the neighborhood can't thank them enough.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

This Seattle store is packed with all sorts of curious creatures and creations.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

The highest point in Washington state is a volcano covered in glaciers.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A wall of chewing gum moonlights as collective art.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.